PWD water tech at the Philly Home Show, 1960 (detail)
Lab tech, water cleaning demo, Philly Home Show, 1960
Torresdale Conduit work gang, 12/18/1906
Bureau of Water, Cumberland, west of 13th Street, pipe line, 1907
State Street pipeline construction, 1904
Jar of raw sewage before treatment, 2000
State Road triple pipeline construction, 1904